I think the model on their display is a DR650S-2ch 128gb.
He kept calling it "the S". It has a front, and rear camera and wi-fi. I've heard not all the features are needed, but come with the top-of-the line package anyway.
Thie installer has earned a rep as a good guy for dealing with Teslas - and is the only go-to fellow in southern arizona. nice rep to have.
Yeah...that's the model with the most features. Looks like he's your guy since he already has a good reputation among other Tesla owners.
Another model you can look into is the Blackvue DR490-2CH. This one was just released on July 3rd. It offers 1080 recording on both front and back cameras but it doesn't offer wifi or over the cloud connection