I have to go with Unkle Spike on this one. 90kg = 198 lbs is a rather large anvil to start with. If you are not doing really large work with the help of several strikers, what good is a big anvil, I suppose bragging rights comes into play, you know "My anvil is BIGGER than your anvil!"
First let me address adding weight to an anvil. At one of our conferences with a guest demonstrator the anvil used was 200 lbs or + mounted solid to a probably 200+ steel base. After the first day the demonstrators forearm was swelled up, and he could hardly grip a hammer handle without pain. The second day the anvil was set on a wooden made up base and after the first 3/4 hour or so of the demo the tennis elbow strap the demonstator was wearing to help combat the swelling and pain came off as it was not needed anymore, because the anvil became a live anvil again granted it had a ring instead of the dull thud of the day before and magnets were placed under the horn and heel to lessen the ring.
Point being having an anvil to solidly mounted to a solid metal base is counter productive to its use and can be injurious to the smith. Even a piece of 1/4 inch plywood between an anvil and a solid metal base with make it a live anvil and more able to absorb the shock and have good rebound.
Second, why do we tie down (anchor) an anvil in place to start with? If the anvil is setting properly on its base it won't move around to start with. If the smith is gonna do a lot of bending fork or other prying work the anvil will skid around on the flat top of the base, so it must be secured from these unwanted manuevers on its part. Usually firmly securing an anvil will lessen the ring it has if it has one.
Staples and all kinds of other devices won't do much good over the long run if the anvil is not properly seated to the base to start with.
This is a picture of my main forge anvil, I use a thru bolt and some eye bolts thru a bolster with hand forged wingnuts to keep it from moving around. on my light oak demo anvil stand I use the same idea but with short eyebolts thru the 1.5 inch base the anvil sets on.
Shop anvil
This is my first attempt at securing the anvil to the demo stand before I went to the eyebolt system, the clips were just reversed and the nuts tightened down.