Your right in the ball park for a Mini 5 which is the now considered the ultimate size and highest power of portable Apples and will serve you for 4 or 5 years in the advancing DJI world. I also have laying around (Somewhere) a PadHat which was considered the gold standard amoung DJI iPad fliers back in the day for sunshades..it was for a
Mini 2 but size wise should reasonable fit a Mini 5.. I could send your way...as they are always out of stock due to demand.
HoodiVision® | PadHat™ anti-glare sun shade for iPad They put much effort into the design and angle and fold right up to be stored under the foam of many cases.
As for a mount they can be printed or bought off Ebay in various styles and materials... I am a machined aluminum guy, I would look into getting one with Neck Strap/harness myself as that weight starts to fatigue the hands/arms after a few flights
Such as this:
https://www.amazon.com/gp/product/B01N7RFDBA/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1