Two cable boxes for picture in picture

I have a Samsung TV with "multi-view" feature, which is basically like picture-in-picture, if you want to think of it like that. 

I'd LOVE to watch 2 on 3 March Madness college basketball games at the same time on the SAME TV.  Get it?

So here is my question...

Can I have and set up two Comcast boxes into one TV (one into HDMI 1 and one into HDMI 2) ?

I have tried using my one Xfinity cable box in HDMI 1 and then trying to use my tablet to stream (mirrorcast) into my TV for the second source.  Now, that does work until I get to my Xfinity Streaming app and try to watch something on the tablet, then Xfinity tells me I can't do that.   Clearly, Xfinity's streaming app has a setting that doesn't allow for miracast (mirroring).

So would using two boxes work, into HDMI 1 and 2. I did try it,  but couldn't get it to work.

Didn't know if anyone else ever had success with that?

I guess I don't understand why my Xfinity app doesn't allow Mirrioring.  It's 2022 people.  Get with the time!

I'm at home, on my Xfinity internet and WiFi.  Why can't I mirror from my phone or tablet onto the TV of my choice.  Or in my case, to get two basketball games on one TV.

Xfinity, you should unprogram that feature and let your customers mirror!!