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And if I'm wrong, please correct me. What is our edge against 4 limpers?

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25.5% equity against four players playing
88-66,ATs-A4s,KJs-K8s,Q9s+,J9s+,T9s,AJo-A9o,KTo+,QTo+,JTo
Thats 20% minus AA-99, AKs-AJs, AKo-AQo.
They are probably looser then that but it doesnt affect the equity to any bigger extent.

Still thats a decent edge. And even so postflop we will know where we are standing so we will always get the most of it. Against the normal 1/2 players i say its an easy raise.