[reneg]

I've connected two Tivos to the same TV. You can use a coax splitter to split the cable signal coming out of the wall so that each Tivo has it's own cable input. And then as posted above, you can connect each Tivo output to different inputs on your TV.

 

[reneg]

Tivo has an article explaining how to change the remote address to have two remotes control two Tivos in the same room:
https://support.tivo.com/articles/Features_Use/Controlling-2-TiVo-DVRs-with-Separate-Remotes