It is never good practice to place an appliance that takes high power either on an extension cord or on a "multiplug". Most household circuits are wired with number 12 copper wire. If the extension cord is number 12 and if the "multiplug" is wired for a 20 amp circuit the you could be OK..
However, if you want to be on the safe side, then the use of a duplex 110 volt 20 circuit would be in order. Keep in mind that kilns can take from 10 to 18 amps. And a concentrator perhaps 4 to 5 amps. It could be very easy to overload the circuit again depending on your kiln rating which was not stated.
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