OK... we were typing at the same time. Yes, place the container where you think you want to plant the rose. That's one of the best ways to find out if a rose will like the site you have chosen.
Use a commercial potting soil for your container. They are designed for good drainage. Native soil may not drain well enough when used in a container. When you take it out of the pot to plant the rose, you don't need to remove the potting soil and can use the native soil for the planting. If you dig the hole now and then backfill it a bit, you can observe how fast that olive tree tries to invade the hole. That will tell you a lot about whether or not it's a good idea to plant the rose there.
Smiles,
Lyn
