I have a similar panel (FlexSolar 6W). Until last year the panel was on top of my handlebar bag. Convenient - worked well.

This summer it'll have to be on the rear rack as I no longer use a handlebar bag. I am considering options. Most likely, the panel will sit on top my food bag that is lashed on top of my rear rack.

Not sure how to deal by the battery bank. For now I plan to glue a female Garmin quarter mount on the back of the panel and a male adapter to a small battery bank. Or perhaps mount a small pouch to the back of the rack.