A couple of assumptions here: first, with two dual-tuner DVRs, and only two TVs, they will both run in single mode; second, you're not talking about HD DVRs.
In that case you can put them both in the same room where the "primary" TV is, if that TV or sound system or whatever has multiple inputs. The two "TV1" remotes then stay in that room. Both TV2 remotes go to the other room. Use a splitter to combine the TV2 outputs to the other room. All four remotes of course need to be different addresses, and the TV2 channel needs to be different for each receiver.
Use a phone line splitter and a short cable to connect both DVRs to the phone line to avoid the "because we can" fee.
If your TV is so old it doesn't have any kind of video inputs, use another splitter to combine TV1 from both receivers. One of them on channel 3 and the other on channel 4. If doing this in fact causes them to interfere with each other (unwatchable signal from both) then in that case then I concur with what rcdallas said.
And yes it will cost you $11 bucks for the luxury of having that 2nd DVR, $16 if it's not connected to a phone line.