Don't be afraid of lipo batteries, just respect them. Educate yourself on the subject and they will seem far less scary.
I don't recommend using cheap lipos. Zeee lipos seem to perform poorly in comparison to other reputable brands. I would consider SMC, CNHL, Liperior, just to name a few. Lots of threads on here about quality lipos that you should read.
That being said, no lipo is inherently dangerous or safe. It's the user that makes a difference. Proper maintenance means everything. I encourage you to read the many threads on here about that specific subject. I'd also strongly recommend a good quality charger. Cheap chargers will only damage your batteries.
Nice looking fleet of cars you got there. Enjoy and be safe.