Any floor-standing or bookshelf speaker is designed to set out in a room regardless of whether it’s sealed, or with a port on the front or back of the cabinet - that’s how they’re voiced when built. Speakers that can truly go against a wall or in the wall are voiced specifically to do that. Unfortunately, there aren’t many audiophile options in that category for that purpose.
If you have the ability to go against the wall without the speakers being seen, or particularly if you can go in-wall, then I would recommend looking at Paradigm’s Elite LCR 7’s which are designed to go in-wall. However, you can take the bezel off that goes around the cabinet that holds the magnetized grill cover on and you end up with a very plain box that can stand or lay in a cabinet or against the wall. They are, however, designed to be placed up in a wall or cabinet and not stood on the floor. These are the in-wall version of Paradigm’s Prestige 95F’s.
Please go to paradigm.com with this link after it to take you directly to the model if interested /en/in-wall-speakers/ci-elite-e7-lcr
Thanks for your time and good luck in your search.