Easy Fit blackout blind

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Can anyone recommend a blackout blind that you can fit without drilling? I've seen some on Amazon but the reviews are mixed. Anyone found one they're happy with? Nothing too expensive.

Does it need to be a blind OP? I've just got some blackout lining for toddler's room curtains and they are fab. We did use the gro stick up blinds they are ok but a bit of a faff.

I have these linen curtains and they are sheer which I really like. What I do is open the blinds and leave the curtains drawn, as my bedroom is beside a road and people can see in if I open the curtains. I've had new sash windows fitted and I don't want to drill into them so I was thinking of getting those 'easy fit' blackout blinds which you fix on rather than drill. I need black out as the sheer curtains obviously let in a lot of light.

I was thinking about black out material behind the curtains but then, I would need to open them as obviously the bedroom would be dark. Then people could see into my bedroom as they walked past. I also considered that stuff you stick on the windows but again, it would let in lots of light first thing in the morning.