The answer to your questions depends on what material your want your tray to be made of. Laptop trays can range in price from 10 to 100 dollars.
Good laptop trays are cushioned lap desks with grip on the top.
How much does the cheapest cardboard lunch tray cost?
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A properly installed laptop tray should not flip over. You can nail or screw the laptop to the desk or not use a laptop tray if you fear for the safety of your laptop.
You should make sure the laptop tray has ample space beneath the tray for ventilation, particularly if you have large bedding. I use something like this: http://www.amazon.com/Space-Laptop-Multiuse-Notebook-drawer/dp/B001G8QG9O. I would suggest the type that will roll out of the way when you are done. There are several good bargains for laptop tryas on Ebay
The cost to have a shower tray installed ill depend on the type of tray you choose. You can expect to pay about $20 per hoor for the labor.
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it depends. Usually is it is the final tray/retainer I heard 300. For a regular tray $65
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There is no reason why it should. The tray isn't connected to the electronics, after all.
Laptops should be put on a "Cooling Tray" or "Cooling Pad" as most people call it. If you do not wish to invest in a "Cooling Tray/Pad", do not set your laptop on a bed or carpet during use. A laptop, without a "Cooling Tray/Pad" should be on a desk or table at all times, so there is good ventilation. Failure to have ventilation can cause problems within the laptops hard drive. (Over heating) With a "Cooling Tray/Pad", a laptop may be placed anywhere, as long as the vents have space to maintain air flow to prevent over heating.
About maybe around 3$ to 5$