Yes - you can do that.
I have 4 or 5 wires coming into the positive terminal on my house battery, and it works fine.
Remember, all of those wires that leave the positive terminal on the house battery need to have a fuse or circuit breaker, and that each of them should be mounted as close to the battery as possible.
I really also like the 2 terminal stud fuse block mentioned above - the only thing that made me not use it is that unlike a breaker, you have to carry spare fuses and it does not provide a means to turn off power to the loads it serves (ie you can't use it like a switch), but still seems like a good way to go in that it provides an extra terminal to hook to, and it puts the protection right at the battery terminal.
Gary