I would skip it. A lot of places don't allow them because they are a tripping/slipping hazard. For instance, the church we got married in did not allow them. Instead, you could line the aisle with petals, lanterns, flower arrangements, etc.
I’m sure your planner has considered this, but perhaps you could measure out 8ft for a ‘trail’ aisle to ensure that it gives ample space for three abreast to walk comfortably.
Do you have a specific color/style aisle runner in your head? What will go with the rest of your decor or your wedding theme?
I would definitely recommend searching for a 5ft wide runner on Amazon.
Depending on your venue and the flooring that is there already, you could consider earias’ suggestion of simply lining the aisle with petals or lanterns. It can be a beautiful look if you are finding it difficult to find the perfect runner!