- Banner: 18 oz custom vinyl banner with grommets That is the best fit for a large 8’×8’ display where you care more about rigidity and durability than absolute lowest cost.
For an 8’×8’ banner, a good default is grommets every 2 feet around the perimeter. That is a common standard among banner printers and is generally recommended for larger banners because it distributes load better and helps keep the banner taut.
For your case, since you said sturdiness is important, I would not do corners only. On a banner that large, corners-only mounting is more prone to sagging and stress at the corners, while every-2-feet spacing is typically recommended for large or outdoor banners.
FUDESY 8×8 heavy duty backdrop banner stand ( https://www.amazon.com/FUDESY-Backdrop-Adjustable-Background-Photography/dp/B0BVB1K592?th=1)
B33.5”x 80” Custom Retractable Roll Up Banner , Aluminum Portable Frame Personalized Banner with Padded Canvas Bag for Trade Show Exhibition Store Displays (33.5*80″ with Printing)
https://www.amazon.com/Retractable-Aluminum-Portable-Exhibition-Displays/dp/B0G48JGM97/ref=sr_1_1?dib=eyJ2IjoiMSJ9.XD1ZjHBp-nYI7MChtwpCF6Oj7lAHx5wf39FrFMIuHNNVcnCz6B4kIdET8OV2VaZiwjkqKcSp4YgTApfBelqgIGIL_muOvuCHBO72eMFk-pa7WQgDDiB7Fd52BrECrDmGdLKRQ-igZsfNIokDRr5dkZz42A7MMsSim_ReQeakTatQQPsYMhnI4WN_NZEs9Vbb3WfORURXVuuz02LdkRqkdMkJG6uElyZ27g3uuXC7JybG1rsN1NyW2D3x6Ep58ocMSROk5D_-Br0llEdA3D3LJjnvid241LMEyDW7VRnPL1M.xLUdRMKAbZZzqX_pP5u991jiByrRhaIJckJFghZrvug&dib_tag=se&keywords=33.5%2Bx%2B80%2Bheavy%2Bduty%2Bretractable%2Broll%2Bup%2Bbanner%2Bstand&nsdOptOutParam=true&qid=1775473754&sr=8-1&th=1