Yeah, tell him to go to Frodo's install shop. It's in fantasy land!
No, in all seriousness, it's next to impossible to install anything in these new model Toyotas without drilling. I have a thread on here about installing radios in a 2013 Corolla. I guess it would be possible with remote head radios and suction cups, but you will wind up drilling into the rear trunk to mount the radio bracket. I guess you could mount it with Velcro, but just walking it to the corner and giving to the nearest crackhead would save him having to buy a new window.
As for the antenna, there are lip-mounted antenna mounts. I would personally recommend a standard NMO mount with an L bracket. He would still have to drill 2 or 3 holes, but they would be hidden and tiny.