I use Ram xgrip. There are a couple other versions RAM makes but this one works. The only thing that "sucks" is if you use the rubber strip, it is not the fastest thi g trying to get the phone off. I have an S8 with an otterbox case. Fits just fine.
WWW.Rokform.com This baby is rocksolid definitely your phone won’t fall off with this one a little Pricey but well worth it. Easy on easy off with the phone and the case is really shock proof kind of like an otterbox. It is CNC aluminum you can get it in polished aluminum or black anodized which is awesome.