Hello, Congratulations your recent purchase of two Trek Verve+ eBikes...Great bikes, Great company.
I also have two Trek eBikes, a Powerfly7 mtb and a XM700+ commuter so the weight is slightly heavier.  I transport them all the time on a Saris Superclamp 2 .
Unfortunately it's discontinued. The replacement is the Freedom Super Clamp2.    
(Link Removed - No Longer Exists)  The beauty of this rack
is your bikes will not bang into each other.  
Saris makes excellent products reasonably priced, made in the USA, Wisconsin.  I love my rack. It's a snap to remove from the hitch which I do all the time.
My car is a 1993 Honda Accord.   I bought my hitch online from eTrailer.com. They are great with excellent service.  
https://www.etrailer.com/ 
Good luck and enjoy your new bikes,
John