For the most part you cannot edge bend planks at the bow without them lifting. The best way is to spile the planks. A very close second, after they are tapered in width is to pre-shape around a form using water and/or heat. I have done this at room temperature, but it takes a few hours on a hot day so using a hot air gun reduces the time to a few minutes. You have probably seen these methods posted here at SoS including photos and videos. The best video that I have seen is probably Chuck Passaro's four part video or variations of his methods. If the plank is spiled or otherwise properly pre-formed, no nails or clamps are needed. Finger pressure for a minute or so with PVA, or even less time if you like CA glue, is all that is needed.
Allan
The photo below shows a wet plank that was bent to the curve needed and held flat with clamps. The heating was with a soldering iron, but I have since gone to a cheap industrial hot air gun from a local hardware store with is easier to control and is faster.
View attachment 503823
You can see in the below that the wood is nearly dry compared to the first photo. Once dry the clamps are removed and the plank will hold its shape.
I bend in the other axis is easy to do with a hot iron, plank bender, or jig and hot air gun.
View attachment 503824