Security system recommendations while living in an apartment. I don’t trust the other tenants.?

I’m moving with two other friends into a 3 bedroom apartment. There are security cameras installed, but they look very outdated. My friends and i will be moving with quite a number of expensive items. There are some tenants we’ve seen that we just don’t trust. We just want to feel safer leaving our things at home.
Any suggestions?

We don’t want to get a dog, and i know we can always buy some stickers but i’m also worried that that’ll only DRAW attention to us.

I live in Ontario, Canada.