Networking Dilemma

Hi there good folk,

The new place i am moving into has the internet come into the house on the other side of where I am planning to have my office + my NAS(which needs ethernet). I much prefer having my stuff connected through ethernet, but not sure what do now, as I cant really run cables across the house. Am also renting the place so cant drill holes in walls etc.. As far as I know, there are two ways for me to get ethernet in my office:

1. COAX to POE: The place does not have ethernet ports in the walls either, but it does have some wallmounted coax sockets. Is it worth looking into coax to poe adapters for either end of the sockets? Not sure how much of a fan I am of this due to the amount of cables this ends up being.

2. The other way would be to have a WiFi-extender in my office, but i guess this will sacrafice some more speed than the other solution(?). This way I would have a small switch connected to the extender which will get me some more ports too.

I am planning on buying into the Unifi prodcuts, specifically the Unifi Express device as a router. While expensive, I love the polish and feature set and control it brings. What other Unifi devices should I get into, considering probably wont be able to use PoE?

Lemmy know your thoughts, opinions and the rest - am open for all sorts of solutions!