I believe you've got most of the answers in other threads. However I post here as well.
There is usually no problem connecting 4 PS Eyes to modern laptops with Intel's combined USB 2.0/3.0 controller given there are sufficient USB ports.
Drivers for PS Eyes are included with iPi Recorder installer. Just check an appropriate option when running it. Windows 10 is supported, no worries.
You can find detailed comparison of PS Eye vs depth sensors in our docs
http://docs.ipisoft.com/Multiple_Depth_Sensors_vs_Sony_PS_Eye_ComparisonActually, you can get much bigger capture area with PS Eyes than with Kinects. Because depth sensors have limited operation range defined by a technology used while color cameras only need an actor to occupy a reasonable number of pixels in a frame. Of course, for big capture area you'll need even bigger total space for placing cameras - extended by about 2 meters in each direction.