Unfortunately, the problem is in the Unraid platform, your databases will be corrupted again and again, until you downgrade the Unraid to v6.6.7 or moved from it to any other system.
About timeout option it should be -t 300, not t-300. For example, to graceful stop the container:
docker stop -t 300 storagenode
In case of Unraid you should use their package manager, the apt only for Debian-based. So the more simple way is to use a docker-way, which described in the same article.