Good to hear! Do you have the C5v1 or v2?

I'm not so much into Asus routers though I'm currently using a RT-N12D1 (was mine but now my neighbours) and I have an old RT-N16. Sorry.

It's dual band, tri stream.
https://routerboard.com/RB962UiGS-5HacT2HnT

Actually all you need to know is in the name.
RB962UiGS-5HacT2HnT
RB - RouterBoard so you know it's a Mikrotik.
9 - Form factor, boring beige box.
6 - 6 physical ports (5 GBe + 1 SFP)
2 - 2 radios 2.4 & 5Ghz
U - has a USB port
i - has PoE out
G - has Gigabit ports
S - has an SFP port
- - breathing space
5HacT - 5Ghz High power AC Triple chain
2HnT - 2.4Ghz High power N Triple chain

There you go.

PoE is Power over Ethernet so you can send power to another device over the same ethernet cable. The 2nd device no need power adaptor. Makes cabling easier.

Mikrotik is quite intimidating because it presents a lot of information. Just need to ignore what you don't need. There's also a quick setup wizard now called QuickSet which makes things easier. You can have a look at my UniFi setup guide to see how easy it is. Link in my sig below.

Here's a demo router that you can play with.
http://demo.mt.lv

You can use ssh/telnet for command line or the web interface or download winbox.exe from https://www.mikrotik.com/download.

Winbox is a Windows app for configuring the routers. It's very fast. It doesn't look pretty though.

PoE is Power over Ethernet so you can send power to another device over the same ethernet cable. The 2nd device no need power adaptor. Makes cabling easier.

Mikrotik is quite intimidating because it presents a lot of information. Just need to ignore what you don't need. There's also a quick setup wizard now called QuickSet which makes things easier. You can have a look at my UniFi setup guide to see how easy it is. Link in my sig below.

Here's a demo router that you can play with.
http://demo.mt.lv

You can use ssh/telnet for command line or the web interface or download winbox.exe from https://www.mikrotik.com/download.

Winbox is a Windows app for configuring the routers. It's very fast. It doesn't look pretty though.

Best is 2.4Ghz N, frequency I set to auto and let the AP choose.

I have a DLink 5Ghz AP in my office. The rest of the house is covered by the Mikrotik's 2.4Ghz. No 5Ghz for Mikrotik. Actually I have a hAP AC lite but haven't set it up yet.

Normal setup, for example if you follow my guide, Lan1 is the WAN port. The modem will connect to Lan1 but you can change that.

Let's say you're powering the Mikrotik from a PoE switch then it must go into Lan1 (PoE In). Therefore you cannot use Lan1 for the modem. All you do is setup the Mikrotik so that the WAN port is Lan2, ie: cable from the modem goes into Lan2

I think the price is OK but that's the hAP AC Lite. It's the little brother to the hAP AC. It only has 100mbps ports and single stream for 5Ghz. The WiFi transmission is also not very powerful.

Connect to modem or router?

Assuming hAP AC default configuration where Lan1 is gateway and Lan2-5 are switched.

Case 1: using hAP AC as router
modem --> hAP AC LAN1

Case 2: not using hAP AC as router
modem --> TMRouter --> hAP AC LAN2-5

In this setup the hAP AC Lite is not a functioning as a router but as an AP. And you're right, hAP AC lite Lan2-5 to DIR-850L Lan1-3, assuming Lan4 is used for HyppTV.

Later when you're more comfortable with the Mikrotik, you can reconfigure Lan1 so that you can use all 5 ports on the hAP AC Lite.

Well, if I were you, I'd use the hAP AC Lite as the main router. It'll be a waste just to use it as an access point.

Nothing posted here yet. Might take some time for TPLink. Hope they can prioritise cos should be more and more C1200 users in Malaysia.