(on-prem, now aws or azure...)
There's a few, go look
I've used OPNsense but I would like to use a IAC tool like terraform to automatically set that up
https://registry.terraform.io/browse/providers?category=networking
The opnsense providers there are either unmaintained or not nearly complete (feature wise). Which is why i am asking for a different platform. (not OPNSense then) which is also open source and has a terraform provider. Maybe you have experience with one that you could recommend?
Pick one of the vendors from the list of official providers, nobody can pick a solution for you.
It would still be nice to get an opinion. That's all I asked for. I did not want a solution from you. I can use an ansible provider and set things up by hand kinda but still. I would like a personal opinion of someone that worked with something different to get a different point of view. It is sadly not helpful to send a link to a list of providers for networking if most of them don't even are compatible with what I asked for or serve a different purpose at all.
The answer to your question is "It depends on yourself"
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