Any Idea how to setup a UBEC?

Hi I’m using a skid with a telemetry and lidar.

Telemetry did not has enought power from cube2.1 and finally I attached a Ubec that powers out 5V 10A.

The A2 lidar has the motor rotation & power connected to a Ubec. Telemetry too.
In order to work properly I attache GND to GND telemetry2 and Lidar Works
Telemetry has to be powered before start pixhaw2 if I want the board works. If I power later the telemetry did not work

Any idea how to power all the systems? the is any device to power all the systems? I saw this board: but I did not trust a lot :wink:

Thank’s for your help