Few things universal about these fat tire folding ebikes:
1. They are heavy, well over 50 lb.
2. May be difficult to transport, normal bicycle rack may not secure these heavy ebike for transport.
3. They take up more space when not ridden, even when folded; they could be difficult to move around in the garage.
Depending on your (stature, weight &) cycling goals, if it is just to regain some leg strength post surgery recovery, you may consider a normal 20" ebike that is under 50 lb., since you're going to use a suspension seatpost, the cumbersome fat tire would not provide much benefit, unless your rides consist of snow/mud/sandy terrain that require extra tire contact patch to provide traction.
Operating a fat tire bike on pavement get very noisy, tire noise gets louder the faster you travel.
If mostly ridden on pavement or hardpack trails, consider a Lectric XP 2.0 at $999.
I've got one myself and bought two more for my employees to use as daily transportation & ditch their cars.
Here in NYC metro, I've seen lots of them used for delivery service.
They seem to operate in all weather conditions, 24/7; if these ebikes are not reliable, they would not be popular among workers that have livelihoods dependent on their ebikes.
The Z2O, that's also pictured is a short wheelbase 20" ebike, about 47 lb.
the handling maybe a little "twitchy" or "too quick", but at speeds lower than 25 mph, they work just fine.
My 78 y-o, father in-law rides it to his fishing spot in Queen, NY and do minor grocery runs on it.
It's not a powerful ebike, but does provide enough assist to get him around at his pace.