I have the Torklift hitch on my Prius C and I've been very happy with it. The Prius C hitch comes in 2" or 1.25" variants, and since Torklift manufactures these hitches themselves I'd be willing to bet that if you contacted them you'd find that they could make a 1.25" hitch for the Bolt if you needed one.
I personally prefer getting the 2" hitch even though I'm only using it for a bike rack because "you never know" what you might need one day.
These videos show that the ground clearance below these hitches is virtually the same - the Torklift video has a side view "insert" at 3:30 that shows it barely below the plastic bumper fascia. The Draw-Tite video shows it at 5:32.
My brother and I installed the EcoHitch on their 2017 Bolt EV:
It took us about 2 hours. The hardest part was unclipping the two rear wheel arch trim - and one of the two plastic clips on the lower edge of the bumper cover broke, and I had to repair it with some electrical tape.
We varied from the instructions in one important way - shown in the lat 2 pictures. We left a 1.5" connecting strip to strengthen the bumper cover; making a hole, rather than cutting out the whole slot. This is now the third hitch my brother has installed - first on an i MiEV, and the second on his i3 REx. The i3 was MUCH more difficult.
I installed a Torklift hitch on a Honda Odyssey and thought it was solid. However, I had difficulty with fit in a few places. My brother in law helped, and we worked to install the wiring for the hitch at the same time. The wiring job was probably the more difficult of the two. The body/interior panels that needed to be removed and replaced overlapped between the jobs, so I thought it made sense to do both jobs at once.
I considered that installation a dry run for installing on our Bolt, which is newer. If I go with the Torklift hitch on the Bolt, I may have someone else do it.
This was the first time I have put on a hitch. It was fairly easy, frankly. The hardest part was pulling the fender flares off. We didn't do wiring, though. My brother has done this 2 (or 3?) times before, and he knew how to do the cutout leaving the edge intact - which will make it a better install, I think.
Torklift packages their stuff MUCH better than the other sellers - my brother works for UPS and he has seen them all. The fit and quality was top notch. This is the only hitch with a 2" receiver, as far as I know. The other two are 1 1/4", which is not nearly as robust.