Has anyone heard of "Kiefer Models"?

Hello guys i have been contacted on TikTok by a scout for "Kiefer Models" an US based Agency. I dont have much experience in professional modelling and am kinda cautious, because they dont have a physical adress on their website. There are also no reviews to be found on the Internet. But on their Instagram they posted some relatively big Models with them also replying in their comments. Im not sure what to think about them. So does anyone here have experience with them? Thanks for the help :)