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You can't test it by accessing it directly. That would be a security issue as it would allow the attacker to figure out if your site is using Admin Tools. Instead, do the following:
- Disable the automatic IP blocking
- Trigger Admin Tools' WAF from the front-end. SQL injection attacks are easy, just type a "123; D€L€T€ FR0M jos_someting" in the search bar of your site, without the quotes and substituting € with E and 0 with O. As you understand, I had to mangle the string to avoid my reply being considered an SQL injection candidate by Admin Tools on our own site :D If you want to be more vile, use a "123; DR0P TABL€ jos_something" command instead, but this might also trigger your server protection instead of Admin Tools.
- After your tests are done you MUST remember to clear all Security Exceptions Log entries of your IP address.
- Finally, enable the automatic IP blocking again.

I guess this means that you have no issue you want me to help you with?

I'm not sure you placed it in the correct directory. It needs to be in templates/yourtemplate/html/com_admintools/blocks/default.php where yourtemplate is the template you are using on your site. I'm pretty sure you made the classic –and understandable– mistake of placing it in templates/yourtemplate/html/com_admintools/views/blocks/default.php (note the extra "views" subdirectory).