It depends on yout risk tolerance and your opsec philosophy, but I use Bitwarden to store my seeds, as well as in two other places. But I do not store them in plaintext.

I encrypt the seeds, and store the encrypted text in my password manager. It adds another layer of protection in case your password manager is compromised.

Additionally, I keep the encrypted seed in my encrypted note platform which is synced to a private git repo, and I convert the encrypted seed to QR code and I print it so I have a hardcopy safely stored on site in my emergency kit.