If you invest in any structure in highsec that structure belongs to your corporation - not your character. You can create a 1 character corporation to own the structure and that character can be an Alpha - no skills are required except Corporation Management level 1. A Raitaru will fit in a T1 industrial so it can be anchored by an Alpha.
Defending a Raitaru in highsec is basically a waste of time. Keep it private so it doesn’t show up on the overview and keep a low profile so the corp that owns the structure doesn’t attract attention of highsec mercenary groups. Set your vulnerability timers mid week just before downtime - EUTZ is at work, USTZ is still sleeping. Don’t build it if you can’t afford to lose it.
You are a piece of straw in a very large haystack - it’s easy to remain invisible unless you draw attention to yourself. Raitaru are not attractive targets. It takes a lot of work to kill one and, with asset safety, there is little reward for doing so.