I'd recc dockge over portainer personally. Ive had weird nonsense happen with portainer where a stack fails through portainer but not dockge/bare metal
People are down voting me because they've pledged their soul to the monolith of shitty plugins.
Even if you want all the pieces there's way better versions of them than what you get in nextcloud. Also depending on how many devices you need libreoffice on, might be easier just to run a syncthings instance and sync the files that way. Its what I'm doing for obsidian and its awesome.
Alternatively theres also this but I can't vouch for it as I haven't set it up yet
