I can confirm that the combination of a GT710 as Host GPU & GTX 1050Ti as Guest GPU works. I had problems with vfio capturing my card, so I used the legacy pci-stub. I also did some additional VM settings opposed to @wendell’s tutorial. This post by @MichaelS clearly discribes the steps to take. You might also want to listen to this young man, his video helped me with some extra settings to solve my GTX 1050Ti driver error code 43. I also had to run the nvidia installer twice in my win10 VM.
So, you can use a small, low-profile, single slot, passively cooled GT710 as host GPU. Yet, if your rig can harbor an AMD GPU (like the R5 230), I would go with AMD. Good luck!