for 2 storey houses, no need big and costly ones, ethernet or wifi.
the tm router is ok but not good enough if you stretch it.
consider rt n12hp - i changed to this 3 months ago. get unifi's full speed all the time. as i write , torrenting 1.1 MBps. wifi
the 14uhp has the advantage of 5ghz option (good for highrise plenty wifi users crowding) and usb port for printer, downlds, etc... i think.
what's so difficult to set up? 5 min job!
https://www.youtube.com/watch?v=Y7VUBSFy_es

this model works well for unifi incl voip and hypptv.

not sure, so i think u shud check out the main asus thread and ask if it works with maxis fiber, voip and astro iptv.

don't buy something that isn't compatible!