we will not use wireguard.
I think we will drop the test with the teltonikas, they are simply to slow for professional use. If they could handle more than 100mbit/s ipsec, we would give them a try. But at the moment i would say that this i something for an homeoffice workplace, or realy small office with one or 2 pcs, or something for enthusiasts / private use.
I think we will use the fortigate 40F in our ofsite locations. much more power and also realy cheap.