What do you mean Bridge Mode and Router Mode?
Devices using different drivers may have issues with some station modes (namely station-bridge), see:
Wifi 4-address mode (station bridge) between wifi-qcom and wifi-mediatek - #11 by jaclaz
The Mantbox 15 ax uses wifi-qcom (ax).
For the SXTsq 5 ac you can install the wifi-qcom-ac package IF it is the version with the ARM32 CPU.
Nothing you can do for the SXT Lite5, as it is MIPSBE.