For me, I'd run the ethernet into a switch (this basically turns one ethernet into like 5 options/ ports). Plug a router into one port, so you have wifi and plug an ethernet into another port from the switch into your computer and then you should have a few spares to plug anything else in, if needed, but other stuff should be fine on wifi.
Switch is about £20 for more than what you would want/need.
https://www.amazon.co.uk/NETGEAR-Gigabit-Ethernet-Unmanaged-GS105UK/dp/B0000E5SEQ
I wouldn't bother with wifi repeaters, I've yet to use any that are decent, unless they cost a fortune, or you're using loads to create a mesh. Most are slow, subject to interference, or you get higher speed ones which lose data, if they're crap. Depends how critical what you're doing is. Repeaters may be better now, than when I last used them, but I doubt it, as they're restricted by physics. You need higher frequencies for high bandwidth, but high frequencies are crap at going through walls, and are shorter range etc. Low frequencies are great at going through walls, and longer range, but the bandwidth is crap.
It's why aircraft radars are high frequency, as the signals bounce back of aircraft in the open air, over shorter ranges. Same with submarines, they use low frequencies as the signals will go through water, crap, and even follow the curvature of the earth, if low enough and can travel thousands of miles the bandwidth is **** though. Most routers are very much in the radar/ high frequency range, they ahve to to get the high speeds, but it's why wifi is cack in most big houses, but in the main room where the router is, it's extremely reliable and massive bandwidth.
