I referred to the datasheet for the U1-12RT, and indeed it does say "No battery management system required"...
Traditionally, the Valance battery modules have been known to require an external 'master' BMS in order to activate (turn-on) the slave BMSs that are internal to the modules, and this was well known within the DIY community.
I suppose it is possible they could be making a battery module now which no longer operates in this way (requiring an external module to function). In this case where I might be uncertain, I would defer the question to a tech support agent at Valance, and see if they can confirm that this battery module model number can operate in a standalone topology, not requiring any external device to allow them to operate normally.
If they do have this capability, that would be great, to have a module that functions as is (standalone).
That datasheet also contains some good charge specs on it, and you can read the manual for your Renogy charger to determine if the built-in 'Lithium-ion' preset can operate in that window according to the specs on that datasheet. If not, then you can select the 'User' profile on the Renogy to fine tune custom charge parameters.
A helpful doc I like to refer to is this one:
Sheet5 Lithium Iron Phosphate Charge Voltage Range (LiFePO4) What to charge your cells/batteries/packs to. (SOC),Never More than,3.650,Shown is the "FLAT CURVE" of LiFePO4 cells/batteries/packs. What to not discharge past. (DOC),Nominal,3.200,The steap parts on the left and the right are the "Le...
docs.google.com
It has information which can help you to decide the SoC range you want to cycle the battery modules, to promote long-life and get more cycles out of them. Different people here have different opinions about what exactly is considered optimal, but generally speaking, if you keep it roughly in the green range, the lithium packs will last longer than if you take them higher and lower than the green part of the range.
Hopefully this helps.