@TROOTERDIV With all the new FW patches that were going on with the Plus/BT/Pro range the only 3 things you need to watch with the smart wireless are
1. The range may just not be as expected for the wireless wi-fi signal, do not care about "speed" mesh is to extend the network so somethings have to give/take for operation, stability is the must.....
2. The Guest network does not work passing to the smart wireless, no doubt that is on the todo EE fix list?
3. There is a compatible network feature that does as far as i am aware work through all the unit's but have never used any smart wireless extenders so cannot fully comment how good/bad, does not seem to get many issue thrown up on that feature so you have to say user's deploying said are not getting trouble with it, have advised a few to use and all have worked out ok .
Some link info below if you have need off,
Info links about mesh
https://www.howtogeek.com/290418/what-are-mesh-wi-fi-systems-and-how-do-they-work/
https://www.howtogeek.com/802557/mesh-router-mistakes-to-avoid/
https://www.highspeedinternet.com/resources/how-to-set-up-mesh-network#:~:text=You%E2%80%99ll%20only....
