Can I Bi-amp speakers with single surround amp?

I just purchased Swan Diva 6.1's which I am able to Bi-amp. I am considering a Rotel 1075 or similar amp and wonder if it is possible/prudent to use a 5 channel amp to feed the stereo pair.
No sub or center in the system, so I wonder if the 0 load on the 5th channel is a problem.
Thoughts?
Thanks