They are a bargain at that price, you can mesh them together, but its not a proper mesh setup like orbi or zenwifi, as these do not have a dedicated backhaul channel, its more like a fancy repeater with seamless hand off, so with wifi devices internet speed off of a non wired satellite will be subject to approx half speed internet due to relay traffic, you can do stuff like split 2.4g and 5g to stop this behavior if your internet is not that fast or wire a backhaul for best wifi mesh peformance.
IMO it is still damn fast though wifi meshed without wired backhaul and great for banishing dead spots, if you treat them as a wifi bridge for lan devices you will get full speed over wifi as it doesn't then have to repeat the signal through wifi ap to wifi device.
You can also use them as APs for machines that don't have wifi but have ethernet, so a cheap alternative to a wifi 6 network card obviously in close proximity you'd be limited by the 1Gb LAN port but I have not seen more the 1.2Gbps in testing, so not loosing much.
I have 4, 2 wired and 2 wifi in mesh, I have great coverage everywhere for <£200, which I though was great, the price those are now would have been amazing, the 4th one is probably superfluous but I was having trouble with a wifi asecurity cam that I assumed was weak signal turns out it died.
The AI life app doesn't work so well for 4 as you can't click on the fourth to get to the device page but you can still get information of the fourth and manage it from webpage off of the first device,