I recently bought a 3 pack XE75Pro to replace my old Netgear mesh, works great but in the app shows that connection between Router and first satellite is weak and there is a good connection between the two satellites! I cant move them to try to fix that weak point, I was thinking getting one xe75pro if there is a way to only buy one and put between the router and first satellite. If there is no way to get one xe75pro, can I use the TP-Link AXE5400 Wi-Fi 6E Range Extender (RE815XE) as part of the mesh and not break anything in my network? Am I effecting my dedicated backhaul speed by using RE815 XE in my mesh network? Thank you