Morden Sunrise grows well here in Kansas where humidity is usually low. This year, we've had unusual rain and humidity and I notice Morden Sunrise has much less blackspot than the other roses. You found a great bargain! I saw it this year at Home Depot and was waiting for them to go less than $15, and they sold out at $15---and they were labeled Mr. Lincoln or something crazy like that. The Bonicas were labeled Morden Sunrise, so that's how I figured out the mixup.
If you are asking about the color combinations, I think I would put another color in between the roses. You could do this with annuals or perennials, not necessarily roses at all. Morden Sunrise has a clear color where the other two are more creamy pastels. Maybe some heliotrope? Something dark purple, or even a dark grass, for example. Maybe Red Flame miscanthus. ( purpurascens)
Here, Morden Sunrise and Bonica get about a foot taller than the flower carpets do. Don't know if that will matter to you or not.
Hope that helps! Post pictures!
