What do y'all use to put up posters?

I wanna put up these paper posters (they come rolled so I need to put all 4 corners on the wall, and I'm not framing them), I will not use tape (maybe double sided), sticky tack or those like flat headed tacks as I don't wanna damage the posters, but I still want it to be like exactly on the wall (no gap). So what do people use?