Good question. There are many ways to satisfactory mount an anvil on it's stand.
A stand for a 30K anvil does not need to be too big since that size is considered to be a portable anvil.
I have a Kohlswa 25 and when I need that size, I just have it on the bench or table wherever I happen to be. Actually I have also a 40K anvil, I tend to use that as portable too.
If you want to build a stand for it, it will depend on what type of floor you have in your workshop. A stand will have to absorb the remanent of the impact of your hammer (whatever was not absorbed by the anvils inertia), and keep the anvil steady.
You can have a stand made of a wooden stump, a metal tripod or a metal sand box.
For a 30K anvil your stump will not need to be in the ground as the case for a heavier anvil, so even with a concrete floor you can use a wooden stump. It can be chainsaw cut from a log not smaller than 10", or 4 bits of sleepers bolted together. The most important thing is for it to be square and leveled. You can achieve this by making a jig for a router and get both faces parallel.
The height of the work surface must be the distance from the floor to your hammer in your hand, with the handle horizontal and your arm hanging down. If the floor of your workshop is dirt or pavers, I would take a longer log and bury it to gain stability. The anvil legs can be fixed with spikes, coach screws and a flat bar or even with a few large nails bent.
You can make a metal tripod using heavy angle. If you do so make sure you weld a square or round shoe to the end of each leg to avoid damage to the floor or to stop it digging in the ground, and don't give it too much taper so that the legs are not in your way when you work.
My preferred stand is a sandbox made of 5 mm plate. Think of a truncated pyramid each 4 sides are trapeze the base 50 mm wider than the top.
All welded together including the base. The top is open and the base for the anvil is a rectangle that sits (floats) on the sand you fill the box with. The box base is rectangular so there will be two sides smaller that the other two. The sand absorbs the noise and the height can be regulated by taking sand out or adding some more. Having said that I don't think a sand box stand will suit a 30k anvil, the small mass will make the anvil bounce around too much for comfort. It is suited more to larger anvils 80k and over.
Noise from the anvil can also be reduced by using a large magnet attached to the horn also a heavy chain wrapped around the body. You have a very useful anvil but don't forget it is a small anvil and there is a ratio between the weight of the hammer and the wight of the anvil....well that is debatable but I leave that to whoever wants to start such debate.