mounting fritzbox and synology using smb did the trick.
Here what I have put into /etc/fstab:
//10.0.0.1/fritz.nas /mnt/fritzbox/ cifs username=xxxx,password=yyyy,vers=1.0,auto,users,defaults,_netdev 0 0
//10.0.0.9/share /mnt/synology/ cifs username=xxxx,password=yyyy,vers=1.0,auto,users,defaults,_netdev 0 0
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