Question about Ubiquiti AmpliFi Instant Set of 2

I already have the Ubiquiti Amplifi Mesh Router in a set with 2 Meshpoints (year 2020) and an additional 3rd Meshpoint of the same type in operation. Unfortunately, the Wi-Fi coverage is not yet optimal due to certain peculiarities of the flat and the amount of Wi-Fi connected devices. That's why I'm now looking for an expansion option. I can no longer find the previous Meshpoint models anywhere. And I would also be happy if more discreet, compact successor models were available as an alternative. My hope to have solved my problem 100% with the Ubiquiti Amplifi Alien Router with WLAN 6 did not work out. Very expensive, complicated and completely unable to work with my existing, still perfectly functioning Amplifi mesh router, so I returned it. Now I'm simply looking for Ubiquiti Amplifi Meshpoints that I can connect to a power socket in an uncomplicated way (preferably with a cable, not plugging directly into the power socket) and that integrate into the existing WLAN without any problems and without any possible interference that would tend to worsen the WLAN performance. And without the need to connect a LAN cable. I just can't find any corresponding models. If something like this is not offered by Ubiquiti: Would meshpoints from other manufacturers come into question? As a stopgap solution, I have now ordered the Ubiquiti AmpliFi Instant 2 set, although I don't actually need an additional router. But individual meshpoints are not offered for whatever reason. The essential question: Can I assume that the Ubiquiti AmpliFi Instant 2 Set will fit into the existing WLAN without any problems?