Roses are hardy plants, they can whithstand alot of abuse. But with little fibrous roots they'll have a hell of a job to do to flower. They might not even this season and instead concentrate on establishing underground. Good oppurtunity to see how they grow and plan your pruning accordingly. Btw, roses do well in clay soils, so that shouldn't be a problem if that's the case. The siting looks good to me too.
