Not a great idea if I'm honest with autos pal.
Clones are best to do scrogs with
Yes you can use fem seeds and top, let veg for a few weeks and then top more and more of the side nodes. It's how you feel a scrog. And 4 plants for 80cm2 is too much. But again. These are autos. As uncontrolled fems are. Autos have a mind of their own. And don't tend to do well with topping. Your gonna a have a real hard time with it. Not enough time to do a scrog proper which takes up to 10-12 weeks of veg. For a proper one. All you gonna do. Is have uneven large colas and a net that's in the way.
But hey that's me. I just know what I know. And autos can't be controlled.
And you need full control of the veg to scrog your plants. And again, you shouldn't to autos
If it were me, I'd grow 4 big bad ass plants. You might have 1 that's 50cm and 1 that's 100+ And colas not nodes, (which is needed for a scrog) so, lollipop if you have to and remove some of those me energy using fan leafs and take em off. That tents RH/TEMP needs a dropping. As if it's like that in pre flower you gonna have issues.
Defoliation is your friend. But now. Just the big fan leaf lower down your nodes, (making sure to leave at least 2 of your most favored fan leafs that potentially are the least light blocking on top of each node. As they draw energy down your cola. But a trim is needed.
Good luck.