How to publicly display ip cams?

[shawn3090 0]

I have a retail store with 21 mixed ACTi cams and their ENR-140 nvrs. I need to display about 9 of them in a grid to customers as a theft deterrent, and I need cashiers to see a grid of 4 important ones. With analog cams I would use splitters and quads, but how would I do this with ip cams?

 

I was thinking about buying one of those hdmi android sticks, but I found the ip cam viewer app to lag very badly on my android phone.