Yes, there is a 5 year product warranty.
Yes, for two anchors the price would be $325 and for each additional anchor the price would be $160.
Generally speaking kayaks sides are flat, slightly curving or have large curvature. If you don't have a rail or track on your kayak and don't want to install one, the nylon bolt-on bracket would be best for flatter sides. The same bracket with nylon spacers can be used for slightly curving sides. For large curvatures (and agian no rail/track), the aluminum bolt-on mounting plate would be best. If you have a rail/track on your kayak (or if you want to install one), the L-Brakcet Top Mounts work great. 2" bracket for straight sides, 4" bracket for curved. Please contact us directly if you need some help choosing your mounting bracket.
A Bar-back set is included with both the nylon and aluminum bolt-on brackets. A set consists of two narrow stainless steel bars, 4 bolts and a number of spacing washers. See product description and installation videos. One Bar-back set is all you need to mount your anchor. You do not need a Bar-back set to install the L-Bracket Top mount. Bar-backs can be used to mount other items and they are also sold separately.
You need to drill 0.25" holes. When using monofilament line for the placement of the Bar-back, the holes need to be slightly reamed out to accommodate the line used in the installation process. This only applies if you are purchasing the nylon or aluminum bolt-on plate option.
Tip the kayak to allow the bar to slide back to the access opening.
One thing you could try is to position the kayak so that the bolts are vertically positioned as you are trying to make them up (turn the kayak on it's side if you are working on the side bolts). Use gravity to help with the alignment. If you can get one bolt made up, you can slightly tighten the engaged bolt and use a small screw driver or the like to center the other Bar-back hole with the hole in the kayak.
The best orientation is to allow for the tip of the anchor to be underneath the body of the kayak when the anchor is straight up and down.
Under calm conditions, as long as a portion of the anchor rod is laying along the water bottom, the Flexstick anchor will assist in maintaining the orientation at the time of the anchor being set. In higher wind and current conditions, more anchor rod needs to be laying along the water bottom; this means you need to be in shallower water. For deeper water and or high wind and current conditions, two Flexstick anchors will do it. One on each side of your kayak.