If your company has approval to use an iPad as an EFB it must include provision for mounting the device. If they don't have approval then expect the blame should anything go wrong, go wrong, go wrong.
I'll bet there is a bag with paper charts that fit perfectly into those chart holders conveniently secured in appropriate places in your cockpit. Your authority expects you to be using those unless they have specifically authorised otherwise and if they have they will have described exactly how your iPad should be mounted.