PCB layout for shunting RF common-mode current to chassis
(I'm assuming that your chassis is, or is close enough to, a full enclosure. If it isn't — if the incoming wires/cables do not pass through it — things may be more complicated.)

You want to minimize the inductance in the chassis connection and minimize the capacitance to the rest of your circuit. Thus, the connection from filter to chassis should be as short as possible. Do not route it any distance on the board unless you must.

The best form of this is where the filter is itself chassis mount, such as an IEC socket with integral line filter, a feedthrough capacitor, or filter components soldered directly to a panel-mount connector. Failing that, give each filter its own direct connection to the chassis; do not join it to your board's ground plane.


  There are a number of standoffs that could be used for this,


Standoffs are not a great choice because they are usually perpendicular to the signal routing, resulting in unnecessarily large inductive loop area. Instead, use a separate wire connecting to the chassis close to where the wire or connector enters.


  If I should use a trace to a single point, should it be routed in a particular way (I was thinking along the edge of the board)?


A trace around the edge could be a poor substitute for a metallic enclosure if you didn't have one. You're trying to keep this signal off of your board — don't bring it closer than you have to.