There isn't anything you can do, really, as far as maintenance and the electronics of your system are concerned. Those chips are sealed units. Clean them all you want and it won't make a bit of difference. The best you can do in this regard is to be sure that the incoming power is clean, and that the heat generated is taken away. Whether you're with SRP, APS or whoever else, the electricity coming into your home is probably pretty dirty.
Line filters can help.
Many computers these days have somewhat sufficient versions already built into them. The power supply of your computer might even have enough protection - but this usually means that to protect the computer, the power supply will sacrifice itself. How much you spend for an external protector depends largely on the expense and importance of your system. The second major problem with the electronics is overheating. It may not absolutely require a cooling fan, but having one sure does make the system last longer.