Searching for a foldable stand that support any angle and both landscape and portrait mode? Here you should check this out. Satechi R1 Tablet stand is the one you are looking for. Not only it is budget friendly ($44.99 USD only), Satechi R1 is made with durable solid aluminum and it has a nice design as well.
There is an anti-slip rubber pads that will hold your tablet or smartphone in place, and the base is also sticked with not slip material to make sure it won’t slide away on a smooth desk surface.
According to the sales page, Satechi R1 Tablet stand is designed exclusively for iPad 1, iPad 2, Samsung Galaxy Tab, Motorola Xoom and other smartphone or tablet with similar thickness or slimmer. Satechi R1 tablet stand has a 270-degree mount hinge and 180-degree base hinge, and it also support flat-angled orientation for ergonomic typing.
Other than the feature about, you can also fold it away conveniently for storage in case you want to bring it with you when travelling.
If you are interested, you can get it from Amazon.