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How high is "up"?
No easy answer - when they were made, black powder was the load - what condition is the gun? how maintained? what quality? what loads are you suggesting? etc, etc
Common answer is yes, but......
yes if they are in good repair. Tie the gun to a tire for the first shot and stand well back with a string to the trigger(s). The big issues are pitting in the barrel, breaks or cracks in the welds and how tight is the gun on the face. You can shoot them with shallow pits in the barrel and slightly loose on the face but those are things that a person knowledgeable in antique shotguns would have to view and advise. Also avoid using paper shells with star crimps because they are probably longer than the chambers in most antique guns.
The gun in the photo was rusted completely through the barrel into the void space between the barrels and the barrel was only about .010" thick at that point. Muzzles should be at least .025" thick for comfort.