The racks designed to carry two e-bikes will require a 2 inch hitch receiver. Many more options for racks if you have a 2-inch receiver and the cost difference is trivial so long as the receiver will fit on your car or truck. Our Prius is not built to take the weight of a receiver with two e-bikes but our SUV has a factory 2" receiver and our new 1up rack will be added next week.
Etrail.com is an excellent source of products and information. I have found their people to very eager to assist with my own inquiries.