I usually put the kayak on my roof upside down if I can. Getting a cockpit full of rain while it's on your roof can add a dangerous amount of weight. If it's upside down, then a cockpit cover probably won't make any difference.
As far as straps, put a single twist between the anchor point and where the strap makes contact with the kayak. It will help. Make sure they're tight.
Electric Kayak Motor
URCHIN Portable Anchor
Recreational Kayak Paddle
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