My myLaps is in my 1/12 scale and difficult to get in and out of its holder so I opted to get a second one for my WGT.
I use the older AMBs in my 1/10 and 1/8. The workaround for a radio box is a short (3") aileron extension, plug that into the receiver and route the female end out of the box to plug in the transponder. I then affix the transponder with velcro on any of the vehicles.