You are gonna want them a bit higher than that and dont spread them out to far or you will be laid up with a bad neck. Blackfish gave me that advice when setting mine up and it might just be the best advice yet on spider riggin. I would just bite the bullet and get one rack because you are going to spend $60.00 already on two of these. http://www.millenniummarine.com/inde...&product_id=57