My understanding is that Amrock does hybrid, not RON signings. I did a refinance with them as a customer and when I asked if they used RON for their closings, I was told no. They will have you electronically sign any documents not needing a notary and then send the notary out to wet sign everything else.
As to Notarize, I signed up with them in April last year. To date, I have handled over 4000 (4K) notarizations; many of them included both Title or Lender packages. The amount of notarizations has tightened up a bit of the past couple of months as their need for notaries haa been met, but they are beginning to open their platform for notaries to being their own customers and make more per signing that way. I was on the team that beta tested it for them.
If you don’t want to use Notarize, you can try NotaryCam, Signix, ProperSign, or DocVerify. There are options out there, depending on what your needs are or what you want your business to look like. For myself, I stopped doing paper notarizations and only handle RON.