There can be two type of hammer village.

1. Capital 15c Hammer

This is easy to maintain and recommended for beginners. You build hammer in your 15c capital.

2. Normal Village Near to 15c

If you build a dedicated hammer in non capital village, you can have Great Stable and Great Barak. But maintaining dedicated hammer is not easy as you need to constantly supply crop from your 15c. If you send troops to attack of about 10 hours, you need to keep supplying crop every 20 minutes. Maintaining a dedicated hammer is very difficult. Only do if you are an expert gamer or it will take all enjoyment of game with the task of constantly sending resources to hammer.

Unless there are many players supporting your hammer, don't go for dedicated hammer. Go with Capital 15c hammer and few other specialised villages near to 15c that make defence, scouts, etc...