I'd even go higher up the value chain with something like Vercel or Netlify if your stack fits in their offering. Heroku is a definitely a good option if you need more flexibility. The costs won't be a bottleneck until you actually have enough scale that you can afford DevOps staff.
Vercel has the best dev UX in my opinion, everything just "works" the way you expected it the first time, and if not their documentation is very straight forward.
