The ultracade cocktail looks to have vertical monitor so to use it as a horizontal you will probably have to add an additional control panel for horizontal play. Or you might be able to live with the horiz display on the vert monitor. If it is working you have a control interface (usblinx) that plugs into a jamma harness. Are you going to try to use the existing computer or put in a new one? Do you want MAME to use a split screen like the ultracade does when used with the player 1 and player 2 controls?
Feeding frenzy uses a mouse so you can play it with a trackball. The horizontal panel will need a trackball if you want to play it full screen. You might get away with playing it on the vertical screen depending on how large the horiz game shows on your vertical screen.
You will have to determine if your monitor is CGA EGA or VGA as the ultracade can support all 3.