Agree with Fezz. I'll expand on his sigh. It might be marginally passable , at best. The biggest problem is finding the best line on all 3 at the same book. That's about impossible !
A parlay should be used to improve a bet. I'll excuse an occasional shot for like $5 on 4-6 dogs parlayed together on ML, but it's not mathematically sound.
You'd be better off playing them seperately at best odds available. I've never been a fan of parlaying 3 chalks that aren't related in any way just to get a decent return. I think bulls would be the most likely to ruin this one.