PCB Mounting

I’m making a LED Lightbar like ones you would see on an emergency vehicle. But I’m having hard time finding out how I should mount these circuit boards. I was going to use some L shaped bracket but looking at it now they going space each circuit board to far apart from each other. So I need help thinking of a new idea of mounting these boards.

PCB.png

See: https://www.google.ca/search?q=standoff+pcb&rlz=1C9BKJA_enCA713CA713&hl=en-US&prmd=inv&tbm=isch&tbo=u&source=univ&fir=eB_gY0Wd_EsgqM%253A%252CuoEBnNhSKvZIuM%252C_%253Bw9Iqv5jFHgxupM%253A%252CnleOzDMHZ-NFfM%252C_%253BO0n-wq96AHJrgM%253A%252CPz-8o-D8fysdSM%252C_%253BK8z6MKnek6TqhM%253A%252C30haCDgnXSfhQM%252C_%253BD25Ymm4pagRS2M%253A%252ClOe6xd9RluRmlM%252C_%253BZvootjRcYysYOM%253A%252CFU0jGTProsmmdM%252C_%253BZPPjZtszHjBDlM%253A%252CHS_aj1vP7OFxjM%252C_%253BH5rLNE46WAvDnM%253A%252C361m37CTB24PjM%252C_%253B-yswdUyGK1itgM%253A%252CFND6ELJpIjN_mM%252C_%253B-cF8Z4faKPYriM%253A%252C5Klk0zaC4xdU7M%252C_&usg=__w2DY6ABfdUuUK4e-u0JbxldD7Ek%3D&sa=X&ved=0ahUKEwiczc-f5fPPAhVD92MKHcytC_UQsAQILA&biw=1024&bih=748