Thought members may be interested in this, it may save them from wasting time and money with solutions that do not work.
My Resler is linked to a dash mounted Samsung Tab A 7 lite (I wanted to keep my E38 OEM equipment) and an issue has been running more than a single dongle which drains the battery over a long trip, say within 6 hours, I regularly travel 12 hours (1300 klms) at a time so I have tried all the Chinese adapters, which say they will pass through a charge to the tablet as well as power the OTG item, probably 6 or 7 products, none worked.
Finally, I found an adapter that works with three USB A dongles attached so I can run the Resler, Apple Carplay and a trackball controller all together whilst charging the tablet powered by a single direct connection to the fuse box. Plus there is an Android App which means the screen is always active.
There is a list of compatble Tablets on their website, that have been pre-tested
LAVA is a Canadian manufacturer of the best power & data adapters on the market, featuring battery protection technologies that 3X your battery life.
I use the iDrive app as my launcher: https://idrive.ibus-app.de/