where to get electronics installed?

Would like to add a gps/fishfinder and trolling motor to a new boat and would like to have it done professionally, any suggestions in the Detroit/downriver area? Does lockemans do install on these?

Also, I see many boats using a piece of hdpe to mount the transducer so future swaps don't require drilling the transom, are all of those mounts the same or is one better than the rest?

Thanks

where to get electronics installed?