Then you really don’t NEED a second GPU if you prefer to just go HDMI, they work fine but really personal choice.
I run the following;
1 48" Ultrawide Curved - DP to GPU
2 15.6" Touch screens - HDMI to GPU
1 24" Touch Screen - HDMI to GPU
That takes up my 4 ports
Then,
1 24" Monitor - HDMI to USB
2 iPad - SpaceDesk
1 Tablet - SpaceDesk