If the KAT500 is placed below the KPA500, this combination will have to sit
level on the desk because the KAT500 doesn't appear to have a bale. If the
KAT500 sits on top with one or more coax connections and the KPA500 bale is
extended, it seems this might cause the tuner to slide backwards as has been
previously stated. The K2 sits on top of the KAT100-1, but there are two
anti-slide brackets bolted on the top panel of the KAT100-1 to keep it from
sliding back when the KAT100-1 bale is extended.
It seems that anti-slide brackets would prevent the tuner from sliding if
placed on top of the KPA500. Just a thought.