Enjoying your 30-day visa-free trashy Tiongs already?
If you want Tiongs to not cause trouble at your establishment, do what a certain restaurant in Japan did: display Winnie the Pooh, Tiananmen 8964, 'Free Tibet', 'Democracy for Hong Kong' etc at the shop.
Because Tiongs have been utterly brainwashed since young, they are genuinely terrified of 'getting into trouble' if there's the slightest chance they are caught in the same photo/video with those things. They repel them like holy water against vampires. Try it.