The best way to keep a canopy down is with something like this - https://www.amazon.com/MASTERCANOPY-Weights-Portable-Folding-Canopy/dp/B01FD43RUC/.

Fill em with gardening rocks or sand and then velcro them around each leg of your popup. If the wind is projected to be really high then lower the canopy when not in use. Have done a ton of events and these weight bags have always kept our canopy from flying away.