I got the Garmin 93sv w/o tdx ... just for Livescope. I use my Hook 7 for DI & mapping. I bought a Cumberland Crappie Fishfinder Mount for the Garmin and mounted it behind the Hook 7 ... it's about 12" high but has an inner section that can be raised (probably close to 22-23" high).
The 93sv does come with a tdx that's DI/SI .... but a 9" screen split isn't what I wanted, so I got the unit w/o a transducer ... since I already had my Hook 7 (DI) tdx on the bottom of my trolling motor.
One other thing you might want to consider is that the LS power wires & the Garmin unit power wires are only about 6' long. So you'll have to wire them into connections to your starting battery or purchase another battery just for the LS. And since the LS pulls about 5amps per hour ... you might want to consider a battery with a good amount of amp hours. I purchased a AGM with 68ah just for the LS & Garmin unit. Some have even gone to Lithium Ion or Lithium Iron batteries for their setups, just because of the high amp hours they provide.