I downloaded some pillows and cushions that can only be placed on the floor, but they would look great on a couch too, how could I lift them in order to be placed on the couch? and moveobjects didn't help :/

You need 'One More Slot' for sofas:
https://modthesims.info/d/225215
There are lots of these available, all sorts of variations. These for example allow objects of different weights and sizes to be angled too. Take a look at the ones available on this site:
https://modthesims.info/browse.php?...&gs=1&f=38&gs=1
I'm sure there are others on different sites to be found.

Slightly more advanced, but you can directly enable objects to have the AL shiftability. It has to be done to each object, though.
https://modthesims.info/t/316879 - last post shows an even quicker method.

Might not work for all kinds of objects, but generally works for small/medium deco objects. Saves you from having to mess about with OMSPs for quite a lot of items (especially those that can otherwise be put on tables).

Thank you so much! this is definitely gonna work!