I'm using the mod on a Realms server where I'm the admin, but the "flexibleBlockPlacementRotation" isn't working correctly because it's a server. Do you have any alternatives or a version that works on Minecraft Realms? By the way, I'm on version Java 1.21.

That's a Litematica setting, ignore that. Currently there is no option that would make the rotations work on a server without a mod to handle the "accurate placement protocol" rotation request.

The only option for this in cases like Realms where you can't install any mods on the server, is to use player fake rotations. Adding that option is on the todo list, but no idea when it might get added. Currently you can only use the rotation feature with blocks that only care about the block face you click on, such as hoppers, logs, quartz pillars.

The flexible Block Rotations requires carpet mod on the server, so the reason why you can't use it on Realms fully, is because you cannot install mods on the server. I believe you may need to reduce your easy Place Protocol settings.

Sorry for my ignorance, but what is this easy Place Protocol? And where do I change the settings?