Many inshore boaters keep an anchor on the bow roller where it is always ready.
Offshore, an anchor on the bow can make the boat pitch, so it should be stored below, somewhere near the middle of the boat. The anchor also can be lashed to the lifelines of a sailboat or secured in chocks on deck. On the bow If you store your anchor on the bow, make sure it is tightly secured. One on trip we lashed an anchor down, but the boat. The anchor flew off the roller and smashed the underside of the pulpit, before dropping into the water.