No idea on the electric ones.. But, I have never used anchors for my manual awning. Been to lots of windy places and once the awning starts rattling and you can feel it in the trailer, it's time to put it up..
I have those clamp on 'flapper' things for the arms and I put those on anytime the awning is out (2 sets of them too).. But, once the arms start to rattling, it goes in..
I leave it out when we go away too.. But, I'll usually lower it and keep the main arms connected to the trailer.. I monitor the weather forecast for wind and so far so good..
I've seen awnings that where anchored, but all that happens is the frames stay put, but the fabric just rips away from the trailer anyway. Or the frame just pulls out the bolts attaching it to the trailer..
I can't sleep with my awning rattling the trailer at night, so if there is enough wind to do that, I just bring it in.. Been out in my boxers doing it several times over the years too.. :)
Anyway, good luck and do whatever lets you sleep at night!
Mitch
