Security system for renter

I rent some land. I had not had any problems until today, when some ***-**** showed up and wouldn't leave me alone. The landlord sent the **** a warning, but would like to have something quicker available.

I thought I had bought the solution several months ago. I bought a dog from that was supposed to act as a security system. When I tried to activate him today, I discovered that I had somehow gotten the "pet" version. I clearly bought the dog from the guard dog cage. I have a very clear memory of the purchase. I stood there a long time deciding which dog to buy. But the merchant basically said I was a liar or fool. Since the transaction was several months ago, I had no recourse. Rather than offering to help me in some way, she just, basically, said tough luck.

I need a product to protect my rather funny-shaped parcel. Not ugly yellow tape. Not abusive. Easy to set up.

Recent forum discussion of security options:
/327/c8/316900/1.html

Product I have used and for which the creator provides excellent customer service:
Watchdog by Tazare Mulligan
https://www.xstreetsl.com/modules.php?name=Marketplace&file=item&ItemID=420376
There is a link to his in world shop on that page. I was still pretty new when I bought one and he was extremely patient and willing to answer a bazillion questions.

If I read the listing correctly, the product is not really effective for renters.