FHD laptop and external UHD monitor for Resolve?

I'm trying to spec a laptop for Resolve 14 and 15 that will edit and grade 1080 and 4K H.264 footage. Here's my dilemma: Dell XPS 15 9560 with UHD display but only a GTX 1050 with 4GB VRAM, or an Asus ROG GL502VS or GL702VS with a GTX 1070 with 8GB VRAM, but only a 1920x1080 display.
I haven't kept up with computers over the past six years or so because I was only shooting, not editing or grading, so my questions are:
1) Will Resolve 14 and 15 display the full interface and be usable at 1920x1080? The configuration guide says 1920x1200 minimum.
2) If I went with the 1920x1080 display for working on the road, would I be able to hook the laptop up to a larger 4K monitor at home or the office, either through mini Display Port or Thunderbolt 3 (over USB-C) and use that as my main monitor? And if over Thunderbolt 3, would I also be able run external hard drives over Thunderbolt 3 at the same time, as I figure that's how I'll be storing large projects?
Thank you for your help!
I haven't kept up with computers over the past six years or so because I was only shooting, not editing or grading, so my questions are:
1) Will Resolve 14 and 15 display the full interface and be usable at 1920x1080? The configuration guide says 1920x1200 minimum.
2) If I went with the 1920x1080 display for working on the road, would I be able to hook the laptop up to a larger 4K monitor at home or the office, either through mini Display Port or Thunderbolt 3 (over USB-C) and use that as my main monitor? And if over Thunderbolt 3, would I also be able run external hard drives over Thunderbolt 3 at the same time, as I figure that's how I'll be storing large projects?
Thank you for your help!