Wireless HDMI, WiSA or other solutions?

Hi there. I have a friend who is about to move into a house and he is requesting my assistance in getting him set up with a HT. The first choice is the living room and it is fairly big and this is a two story house so I don't know how we could run drops of any kind. This is Texas so there is no basement and the floor is tile so no carpet to run under. I had my initial look at everything yesterday and the best scenario to me looks like running all the AV equipment into a built in shelf in the wall and maybe putting a glass door over that. We could hang a screen on the adjacent wall and run the front speakers normally. The quandary is running the rear speakers, the projector, and possibly the sub. I know the wife would not like exposed wires but if that is the best alternative we can work with that (I have concealers everywhere).

I am going to recommend an Epson 5040UB for him (I have a 5030 and love it) and I know they make a wireless kit but I am a little confused on its limitations. I think the projector itself appears to be limited to around 10Gbps which means (it seems) that 4K 60fps is out but 4K 30fps is okay. Unless you are competitively gaming I don't know if this would affect watching a movie or not. I know that wireless HDMI is also a thing and I have seen some info on it. Linus from Linus tech reviewed one and it seems to be okay but I can't find a lot on it either. Any suggestions, opinions or more info would be appreciated on how to best get the video over.

For the audio I see a large number of transmitters/receivers that seem to operate on the 2.4Ghz band. I have a set of headphones that operate on this bandwidth and I there isn't any loss afaik. I don't see a lot about them but there are a lot. Here is one from Denon:


Finally I am reading bits and pieces on the WiSA standard. I don't immediately see any products on it and searching on here it seems like it might be something that is coming? It sounds great though. I can think back 20 years ago asking myself why it wouldn't be possible to just send signals wirelessly either before decoding or in such a format so there isn't any loss. There seems to be plenty of bandwidth available for both audio and video.

I am not overly concerned with the audio quality on the rears so if there was a small amount of loss I don't think that would be a big issue. These are the surrounds after all. I think it is much more important to put a good speaker there (as opposed to a speaker you buy with wireless built in) with a transmitter/receiver. or even another pre/pro if need be. Even for the sub (depending on where its sweet spot is) I don't think is a huge issue. Image quality matters a lot, which is why I am searching for more data on the best alternative to a wired cable. Even a wired cable run would be pretty long. I know there are fiber optic HDMI cables but they are pretty expensive.

Thanks!