Do you know if your NVR has a Web Server? Or better question, does your NVR have remote access? There are several ways to display camera feeds to tablets.
My old setup, I run
Blue Iris, it has a Web Server that you can get to get to the cameras via a Web URL:
My tablets (Amazon Fire HD 10 inch) were connected to my network via WiFi, same network my Blue Iris PC was on. Made it easy to get to the Web Page. I ran
Action Tiles which was connected originally to
Smart Things Hub but later switched to
Hubitat Hub. Now I run Home Assistant (Action Tile replacement) but have not setup a Tablet yet since we just moved a few months ago and I am still, slowly, setting my network back up.
To keep the Tablet charged I supplied power to it via USB, I installed a
Recessed Outlet Box which I ran power up from lower plug and used a
Tablet Mount similar to this one. Used a plug like this
USB Outlet.
Actually in this video he bought the mount I used from Etsy.com but looks like Motifs Etc. is no longer selling the 3d mounts. My setup was almost exactly like this guys except I came up with power from an existing lower wall outlet.
Here are some other power options:
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You could use something like this
Convertor for power using your existing wires connected to a power source. I had the
Konnected Alarm system in our previous house so I also used the Tablets to Arm/Disarm our system. Had Local Weather on it along with my smart switches and other IoT devices. Will be doing the same in our new home, but several months from now, one switch at a time.
I ran
Fully Kiosk which kept Action Tiles up and alive. For a Screen Saver I used the free version of
DAKboard which gave me weather and connected to my Google Calendar which displayed up coming events. Actually I had both my wife and my calendar displaying. It was a nice visual when you walked by the Tablet on the way out for work. Oh BTW
DAKboard sells their own Tablet, it is huge and quite impressive.
I know this is alot of info but Tablets are not a plug-n-play solution unless you use a whole priority Alarm/Camera system like ADT and they plug-n-plug for you at a monthly cost locked in for a few years contract
HTH