Welcome to our forum.
I personally think it's best to be flexible, as people are all individual and different and unique. You never know what relationship geometry will work out for you, and the poly community has just about every kind of geometry imaginable. I guess what I'm saying is, it's okay to give yourself some leeway.
I hope your stay on Polyamory.com will be an enjoyable one.
Love means never having to say, "Put down that meat cleaver!"