Is it safe to install JS Guardian when their website www.cyberzoa.com has an error?

Hello, introduce me to Angga Permana. I ask for help from those of you who are more experienced in the security field. Thank you in advance

I have a blog that is: https://www.nearestbusiness.com

I want to secure my blog and users who access my blog. But I’m still unsure about installing the JS Guardian application. Because their website https://www.cyberzoa.com has an error. Screenshot below

Please give your suggestions whether I should install Js Guardian.

Thank You

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