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Yes, you can do that, or if the switch is L3, you might just connect directly to it. Further, if the 887s support GLBP, you might be able to connect them to a L2 switch, and load balance.
For optimal egress load balancing, you'll want to use PfR. (Don't know if supported on 887s.
From another router, or a L3 switch, just route out (equally) to each of your 887s.
From a L2 switch, have your two 887s run GLBP in load sharing mode. (For this to work well, you need a good distribution of egress from multiple hosts.)
