The problem with that design is that you end up with only three feet per half instead of four. While this is stable for any load that’s centred within the triangle formed by the feet, your hands will probably end up resting on or near the front edge of the keyboard, meaning it may unexpectedly tilt forwards.
If the octopus feet are too large for you, you could try fixing a 2cm-thick block of a softer material to the bottom of your tented centre bar. This is not 100% correct, as the outside feet are not all the same distance away from the centre and so there will be a very slight twisting moment - however if you use a soft material (such as a cardboard box) the block should be able to absorb the imperfection without stressing the keyboard.