i have bought several cheap BMS boards for various configurations, 4s to 15s, most use the DW03 chip for doing the BMS functions and control the discharge and charge FETs. i reverse engineered all of these to compare the circuits and would recommend that you do the same with whichever you choose. Then you can modify it as needed, or re-do it, to suit your needs. But i wouldn’t trust any of them with my life.
After doing all that, i built an 8s nominal 30V power bank with 18650s where the BMS is ME. i always measure the voltage when in use, and control the charging using a current regulated power supply.
i looked at several boards used in various electric cars. The best design i found is the one used in the Tesla S packs. They have a unique feature that nobody else has, or likely even understands why it is important in critical applications.