If you remove the covers from around the battery in the front you will find that you already have strut braces that run from the shock towers to the firewall. This should be sufficient. The 911 GT3 Cup Car actually has the same front strut brace system as your Boxster! If it's good enough for Porsche's own race car shouldn't it be good enough for you?
But still a little extra bracing can't hurt, it can only help. So if you want to do it and it will make you feel better - go for it. But don't expect a huge improvement over what Porsche has already designed into the front.
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