It depends on how much you can lift and/or will you have help,
I have two Ebikes, one, a fairly simple single hub motor and smallish batt. The other, a two wheel drive w/ a big pack. Both are older, now considered heavy mountain bikes, one under 50 lb.s and the other well over.
I bought a two bike "hanger style" rack and I thought I was being clever and got one that the vertical post actually tilted down when a pin was pulled thinking that would help me mount the "heavier" bike on the rack. It didn't(more on that in a moment).
The lighter bike I could get on my myself, but the heavier one was a no go. Remember, the "hangers" are at about chest height, so the motion is more than a "lift" and more like a "clean and jerk". I tried tilting the carrier down, but the hanger posts were a terrible angle and even after I fought one bike on, it was clear I couldn't push it back up into place w/ two bikes on it.
Another problem I ran into was interfearance between the hanger posts and the wiring of my bikes, which run along top tube. Add to that, the top shock mounts got in the way I wanted to balance the bikes and the wheels w/ the hub motors had to be secured extra tight to keep them from flopping around. I sold that rack and rethought how I was going to carry my bikes, as I never felt comfortable with them hanging out over the back while driving down the road.
I would say that that style of rack would be ok for two very light Ebikes, like road types w/ sm. packs. It's not about load carrying capacity, it's about getting them mounted and situated so the two bikes don't damage each others sensitive Eparts(they do sway around).
For most folks, I think the "rail" style would be a better, if more costly alternative. I don't think a ramp would be necessary as it isn't difficult to lift any ebike wheel, one wheel at a time.
For me, the solution was simple, I have a pickup(I was trying to save space for camping gear)and I bought two pairs of these;
https://www.amazon.com/INNO-Truck-Bike-Mount-System/dp/B07LG1DCVF/ref=pd_lpo_sbs_263_t_1?_encoding=UTF8&refRID=Y2QXQ7WED6GJP663PD0E
They are simple and really hold the bikes well. Once they are locked into place, they never to need to be ck'ed. They are pricey, but they work w. a minimum of fuss!