Steamをインストール
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翻訳の問題を報告
To answer the 1st part, yes it will work, but do not expect help, or support from anyone on this, as no one will assist you on this, if the 3rd party app you use in question steals your information, or not, again the risks is all yours alone to take, you been warn ahead of time.
https://support.steampowered.com/kb_article.php?ref=4440-rtui-9218
Please note if you have a smart phone such as Windows phone, Android, or IOS, you be able to download the Steam guard mobile app yourself, if you have an Android phone, but don't have access to Google play, you can download the app directly from Steam as a standalone download.
http://media.steampowered.com/apps/steam-android/steam-2.3.9.apk
Although you can use an android emulator (like Bluestacks, for example) as your Steam Mobile authenticator, I personally wouldn't due to the risks from third-party data collected by them.
As already mentioned, if you have a phone you can download the Steam app, I think it will work on a Tablet or an iPad too.