I wouldn't bother with the sticky hooks. Maybe those special picture hooks that go into concrete with one bang - they ARE amazing! Only leaves 2 very little holes, with a little bit of filler on removal - I am sure landlord be cool with that.
Don't waste your money on the sticky hooks! Or the sticky pads that supposedly come off in one easy pull - RUBBISH! We bought a big pack of them as we also rent - they've all fallen off within hours but left a horrible sticky residue which as you can imagine attracts dirt and dust like nobodys buisness, they're now more like little black splodges (despite scrubbing at them)