...first recommendation, given your requirement on riding position, would be to make sure you test a few bikes out (at least for size/sitting position, if not actually, though preferably, a ride).
As in non-electric bikes, frames come in a multitude of shapes, styles and sizes and you need to find the best "fit" for you.
As mentioned above, I have two. The original is more of a road bike, upright and with a continental German/Dutch riding stance. It is noticeably more comfortable for a relaxed ride than the other, which is more of a hybrid style with wider tyres and more suitable for rougher trails and tracks.
Either will suffice for both categories of riding, but the "correct" one for the terrain is much more adept and enjoyable than the other.
Whilst they might look less "masculine", I wouldn't write off a unisex step-thru frame (particularly for road use) as they make mounting/dismounting rather more easy (and often have a more upright riding position). Good for back problems.
Decide whether you want derailleur or hub gears. (for road use I'd probably go hub)
All the above is common to standard or electric bikes.
Beyond that, my recommendations become more focussed. You can pay what you want for an eBike, and the quality/functionality generally reflects the outlay.
I think the entry-level sweet-spot for cost vs quality and functionality is in the £2-2.5K range (sometimes depending on the discounts available for last-year's models). Assuming mainly road use, a fully-equipped decent model (mudguards, lights, rack, etc.) can be had from any number of known manufacturers.
What I would definitely recommend is crank-drive (electric motor on the bottom bracket between the pedals), battery in or on the frame tubing (I prefer on for wider replacement options, but in looks neater but can be specific to the bike - both are a better weight distribution than a battery on a rear rack). Minimum of 400Wh battery (500Wh is better, for range of course).
Last but not least, I'd go for a Bosch motor. Only one of our four bikes is such, so it isn't prejudice - all the motor systems have their plus and minus points, but Bosch is much more ubiquitous, which makes maintenance and spares easier, and in some cases, as I'm finding, rather cheaper.
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