[NAME] This is an Alienware m15 Ryzen Edition R5, correct?  If so, it doesn't appear to have a Thunderbolt port, presumably because Thunderbolt is an Intel technology.  Running dual 4K 60 Hz from a dock would require Thunderbolt, so you're correct that your setup would not allow that through a docking station (and a docking station wouldn't adequately power that system anyway).  Your best option would be a USB-C to DisplayPort cable for one display and an HDMI cable to the other, assuming that your 4K displays have a DisplayPort input and an HDMI 2.0 input.  In theory, you could run dual 4K 60 Hz as a daisy chain from your USB-C port if it was used purely for video rather than video + USB 3.x as a dock would run, but to run a dual 4K 60 Hz daisy chain would require that the source system and both displays support DisplayPort 1.3/HBR3 or better and that one of the displays have a DisplayPort output for daisy chaining.  4K 60 Hz displays typically don't have daisy chaining outputs, or sometimes they have one that only supports DisplayPort 1.2/HBR2, in which case the daisy chain would only run dual 4K 30 Hz.  That's why the cabling setup I mentioned earlier is probably your best bet.
After my PC broke down lately I looked for an alternative and my choice fell on the Alienware M15 R5. To replace my stationary broken down PC as well as be a replacement for my surface laptop. So have a all in one device for home and to go. Only thing that is preventing my purchase is that my current setup includes 2 * 4K monitors @ 60hz , run over DP. I want to continue using these monitors when i am at my desk. After some hours of reading and googling i still don't have a satisfying solution to achieve that.  I would ofc prefer a dock solution, but I think that is not possible, because of bandwidth? What would be the best solution to achieve my dual monitor setup with the laptop. Thanks in advance, Greetings from Germany 
m15 R5, how to run dual 4k @ 60hz