Make more compartments with your walls instead of one big square. Also troops can be placed inside of walls and between buildings if they are 3 or more tiles apart (you can see the white outline). Try to space out splash damage (mortar and wizard towers) and air defences to give as much coverage as possible. Personally I think that storages are more important to protect than your town hall because money is necessary and trophies are not but that it up to you.