Sounds fishy as 12 Gpu do not run well or do not run at all with only 4GB of Ram. There is the common consensus between small home miners that up to 8 cards can run with 4GB of Ram although not recommended, the usual recommended Ram is 8 GB if you are mining with a device which has more than 8 cards.

After searching the website of dominorig I don't see office location so anyone interested can go there and check by themself and also the website is done in a very cheap and unprofessional way with Wordpress. These are big red flags for me so I would be cautious to say the least.