>This is too expensive, how about a correct placement of a one router
Because this has it's own set of limits. Especially if you're the in tech living in suburbs type that doesn't have a tiny house.
I had Cat 6 dropped to the TVs/media devices because I don't want constant streaming devices "using up all the wifi". The offices where computers are have network drops too.
This leaves a few wifi units around the house to service truly mobile things like phones and the assorted device that uses wifi that doesn't make sense to network.
If you're going to try to fed 2+ TVs across a sizeable house with a bunch of other wifi capable devices off a single wifi router don't be surprised when your latency is high and or your speed suck.