You can configure HSRP on a single router, but there's not a lot of point. The only point is if there are definite plans for a second router, and the single router is an interim solution.
You mention two switches - I am gonna take a wild guess and ask if you have two switches connected togther and you have two LAN interfaces on your router and want to cover for a failed LAN interface on either the router or switch? If so look at IRB - create a BVI, add the IP config to that and then just bridge the two LANs to the BVI.
The other alternative I can think of is the two switches are "upstream" in which case you would be better off with a routing protocol, or a poor second of floating static routes.
If I have guessed wrongly, please let us know what you are actually trying to do.
