It's better for the threshold stone to tilt inward, in order to increase the wealth-gathering effect of the threshold stone geomantic omen. There is also the emphasis on laying coins on the threshold stone. In the past, copper coins were laid under the threshold stone, but now copper coins are hard to find, and it is also possible to replace them with coins. The number of coins depends on the occupation of the family. If it is a business family, then put 8 coins, which has the effect of peace and prosperity. If it is a public official, then put 7 pieces, which has the role of a prosperous career.