Wire mesh on adequately sturdy supports. Enclose the entire bed, include a gate. So you don't have to remove the fencing from each bush every time you want to do something with it. Including weeding.

If fenced bed is sufficiently small deer will not jump into it. Also placement of clearly visible objects like stepping stones within such an area is expected to be a deterrent. Because they will not want to land on them. Similarly a solid fence above deer head height - as in 6 ft. tall - is expected to stymie them because they cannot see what they would be landing on if they jumped it. Otherwise see-through fencing needs to be 10 ft. tall to exclude deer - I have had a black tailed deer easily clear an 8 ft. fence from a standing position as I stood talking to somebody nearby.

If none of this is feasible where you have the roses now you should replant them where it is feasible.

Exactly what was stated above. I have seen attrative shorter metal fences, but ehtheyey are more of a design element and more pricey. A picture might be helpful, also. This is a nice thing that your family does.