@Peedee
Hi, M7450 has no Ethernet port, so mesh router cannot connect to it via wired connection, if you have WiFi range extender, it should be able to connect to M7450 wirelessly.
Note: M7450 is a mobile WiFi device which is usually used when traveling or in outdoor activities, if you need a 4G home router, you could consider Archer MR600, TL-MR6400 etc., or Deco X20-4G, Deco X80-5G, which are better options for home usage.