Certainly don't just buy a "adapter" and use a standard surge protector with it, because the plug fits. Standard surge protectors are rated at 15A, in the USA at least. ... You're talking multiple rigs anyway, right? So you're going to want a PDU. Spend the money on it, before you blow everything up.
And as we've seen in this very thread ... Electricians don't know everything.
I'm planning to buy this adapter :
https://www.amazon.ca/Conntek-P1450650-Generator-250-Volt-Adapter/dp/B00SSQIYLUand a 40 amp PDU to distribute the power and not blow anything up lol
I'll be using around 3500+Watts. I'll talk with an electrician just in case... thanks for your help.
What you have posted is a 50A. Your oven, as most in North America are, is 40A. That one wont work.
Also, what are you planning? Do you want to power multiple PSUs with this one 40A oven receptacle? If so, then most definitely you will need a PDU for that.
Do you want to power your PSUs with 240V ? Then that is also doable, but not in that current configuration.
Definitely have an electrician check and explain to him in detail what you want.