-
What's the spectrum congestion like? There is a problem with too many WiFi networks on overlapping frequencies and signal power turned up to 11. Rather than one AP to cover the home we need lots of smaller quieter ones but that's never going to happen :(
Making sure you are on 5GHz helps as there tends to be less interference. Living in a log cabin in the middle of the woods with no neighbours for 5 miles is also good but apparently impractical.
I'm about to buy a bunch of 802.11ax access points which claims 3.5Gbps streams and you can have 4 of those per client although I'm only uplinking at 5Gbps.
For home use a bunch of 802.11ac UniFi AP AC LITEs which claim 867Mbps over 5GHz are good and a reasonable cost.
Same room is obviously best but different room can be okay if the construction isn't against you (solid brick walls and foil backed insulation are a PITA, lath and plaster partitions less so).