dun buy the wireless repeater or wireless extender. for these devices you actually need to place very near to the the original wireless router that provides the Internet connectitivy, at least within the coverage. So the place where you can place the these repeaters or wireless extenders are very restrictive. End up you may not really get a pleasant coverage still for the entire house.

Suggest you try to use the homeplug, but in order to use this u need to have a free power socket (with no extension plug). Alternatively, buy those homeplugs that support AC-passthru so that you can use both the home plug while use the same power socket for power to other devices you need to plug.

Good thing about homeplug is that it is using the electricity wiring to transmit data, so you can plug in to any powerplug within your house as you wish, it does not need to be within the wireless coverage as your original wireless router like those wireless repeaters or extenders.

It comes with wired/wireless two types of home plug. if you buy those wireless home plug, it turns into a wireless repeater or extender to your existing wireless network.

you need to buy minimum 1 pair of home plugs to start with, one will be function as master, this is to connect to your existing wireless router, so you will place this next to your wireless router and you can just connect this master to the ethernet port of your wireless router. Normally master one the wired type will be sufficient.

Slave is the one just that wil link to your master via electricity, this one you can choose wired/wireless depending on your need. And different models support different speed etc, choose the one meets your need. Normally if you buy the wireless type, it will come with one extra ethernet port, so you can use it to connect to a device such as desktop that uses wired connection for stable and faster speed. At the same time, this slave home plug will function as a wireless repeater/extender for all your other wireless devices to connect to it.

If your house is big, you can buy as many slaves as you want to cover the entire house.

TP-Link this brand is relatively quite cheaper but performance and reliability wise it is quite ok. You can consider.