question

Every reputable brand of LFP battery I'm aware of lists a float voltage and will also tend to list absorption time if needed; Battle Born for instance, is bulk 14.4v, absorb minimum of 30 minutes per 100Ah, float at 13.6.

Check with your battery manufacturer/user manual for the appropriate settings for your particular battery.

The old "never float" argument tends to be a regurgitation of arguments from 15-20 years ago before anyone really understood how the chemistry works, and is usually no longer relevant.

The datasheet only states "Storage charge voltage (for Standby use) - 13.8V". So I'm assuming this is the float voltage?

But if the storage voltage is the float voltage, then what is the storage voltage in the victron? Should I set these at the same voltage? (There's no option to disable it).

The float voltage for lifepo4 batterys are best set to 13,5V. With this voltage you have a fully charged battery and the charger at the same time support your load. If you are not using your battery for a longer time it is best to disconnect the battery so there is no load and charge on it. If you need to have the charger connected for a longer time, you can use the storage mode set to a voltage somwhere betwen 13.3V and 13.4V.

the absorption voltage and time you should use are the voltage recomended by the manufacturer.

If you use a lower absorption voltage and/or shorter time, you risk that your cells in the battery will get out off balance.

If you don't have specs for absorption voltage and time, then use the standard profile for lifepo4 in the charger. If you experience issues you can set a longer absorption time. Normaly the charge voltage should not be higher than 14.4v. Lifepo4 cells normaly have a max voltage of 3,65V witch in a 12V battery is 14,6V

Battery safe should be off. It is for lead batterys.