Save your money, unless you believe that those tools are going to give you your best groups possible out of your bow without shooting it.
Group tune at different yardages for best results. It may take some "tinker-time", but I feel the benefits in the long run are worth it.
If you buy this expensive tool you mention, and then tweak the centershot while shooting on the range- what's the point of spending that much on this tool in the first place?
You can get a decent ballpark reading with this tool ($13), and then group tune from there: