Amazon Basics Blackout Blind with suction cups, 1-Pack, 198L x 127W cm, Moon and Stars

We live in an apartment. Baby room is bright with blinds. Can I stick them over the blinds and is it possible possible to unfold after every nap?

We are going to Disney world and was going to purchase for the hotel room. Can anyone suggest if I should buy one or two of these to take?

Does this smell at all (especially during hot days)?

Some of my suction cups have broken from the heat of the window. Where can I find some to replace?