This applies for an existing sink or for a new one if you are also buying a kitchen sink. If your existing faucet has a mounting plate on it, check under the sink to see how many holes the mounting plate covers. Each faucet tells you how many mounting holes it needs for installation.Kitchen faucets are available in 1, 2, 3 & 4 hole versions.Some faucets give you multiple options in one to accommodate different sink configurations.his applies for an existing sink or for a new one if you are also buying a kitchen sink. If your existing faucet has a mounting plate on it, check under the sink to see how many holes the mounting plate covers. Each faucet tells you how many mounting holes it needs for installation.