SPI multiple slave termination
SPI allows the so called "Daisy-Chain" and multi-slave topology. You seems to need multi-slave. Note that altough you will need a separate signal for the CS pin of every chip, you can share the MOSI/MISO/CLK pins between your nodes.

For your parameters, I think that a proper routed board will suffice since you are not working at high clock/signal speeds.

I never heard of SPI pins being terminated. You must indeed take care of grounding and avoiding short-circuits.

Note also, that I2C looks like a more appropriate solution for connecting several devices in a BUS (altough with less speed).

You can have your setup like this:

HOST_MOSI -&gt; DEVICE1_MOSI, DEVICE2_MOSI, ..., DEVICEn_MOSI
HOST_MISO -&gt; DEVICE1_MISO, DEVICE2_MISO, ..., DEVICEn_MISO
HOST_CLK -&gt; DEVICE1_CLK, DEVICE2_CLK, ..., DEVICEn_CLK

HOST_PIN1 -&gt;DEVICE1_CS
HOST_PIN2 -&gt;DEVICE2_CS
  ...
HOST_PINn -&gt;DEVICEn_CS


You might want to read link 1.