Go vertical, kids. For keyboard, I have used a Kinesis Freestyle w/ the Ascent explicitly designed for this purpose but now I just use the Matias Ergo Pro with some tripod parts to keep it vertical
https://geekhack.org/index.php?topic=79810.0 (since the pic I have changed a bit but nothing significant, I have these four parts now forming an adjustible, 12" long column: 1/4" to 3/8" male-male spigot, Manfrotto adjustible column, Triopo Short Column, 3/8" female to 1/4" male adapter). The huge advantage of this vs the Kinesis is the super light weight so you can travel with this setup easily. And despite the end result is quite wide it actually collapses into smaller parts so I can just pack them in the same padded tablet bag as the keyboard. Alas, the same bag is now out of production and I honestly have no idea what to recommend. In the same forum you can find other solutions to keep it vertical.
For mouse, Evoulent is good and I have used many generations of it and I can tell you the difference is negligible so you can just go on eBay and buy an older generation for cheap. It is a b!tch to travel with as it is really oddly shaped. Oh well, nothing is perfect.