First, thanks for the posting the photos! Very helpful. Alas, I'm a mountain biker so I have a poor sense of road bike sizing. Could you perhaps measure the length of the floor space between the console and the 3rd row seats, so we can know how tight the chain ring clearance would be? Did you just slide the bike straight in back through the trunk or did you have to do some wiggling/tilting to get the handlebars underneath the roof?
My dream is to fit a fat bike inside a Tesla - I'm cautiously optimistic but realistic about the chances (pretty marginal).
That's exactly what I've done, I just attached my fork mount to a scrap piece of wood (1x8?). Very stable. If you need something more elegant you can pay $90 for
this.